Affiliation:
1. National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, China
2. CAS Key Laboratory of FAST, NAOC, Chinese Academy of Sciences, Beijing 100101, China
3. School of Astronomy, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract
ABSTRACT
We first present a catalogue of photometric redshifts for 14.68 million galaxies derived from the 7-band photometric data of Hyper Suprime-Cam Subaru Strategic Program and the Wide-field Infrared Survey Explorer using the nearest-neighbour algorithm. The redshift uncertainty is about 0.024 for galaxies of z ≤ 0.7, and steadily increases with redshift to about 0.11 at z ∼ 2. From such a large data set, we identify 21 661 clusters of galaxies, among which 5537 clusters have redshifts z > 1 and 642 clusters have z > 1.5, significantly enlarging the high redshift sample of galaxy clusters. Cluster richness and mass are estimated, and these clusters have an equivalent mass of M500 ≥ 0.7 × 1014 M⊙. We find that the stellar mass of the brightest cluster galaxies (BCGs) in each richness bin does not significantly evolve with redshift. The fraction of star-forming BCGs increases with redshift, but does not depend on cluster mass.
Funder
National Natural Science Foundation of China
Chinese Academy of Sciences
Foundation for Angelman Syndrome Therapeutics
Ministry of Education, Culture, Sports, Science and Technology
Japan Society for the Promotion of Science
Japan Science and Technology Corporation
National Astronomical Observatory of Japan
High Energy Accelerator Research Organization
Princeton University
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
22 articles.
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